* {
    margin: 0;
    padding: 0;
}
body {
    background-color: #f3f5f7;
}
li {
    list-style: none;
}
a {
    text-decoration: none;
}
.clearfix:before,.clearfix:after {
    content:"";
    display:table; 
  }
  .clearfix:after {
    clear:both;
  }
  .clearfix {
     *zoom:1;
  }   
.w {
    width: 1200px;
    margin: auto;
}
.header {
    height: 42px;
    margin: 30px auto;
    /* background-color: pink; */
}
.header .logo {
    float: left;
    width: 195px;
    height: 42px;
}
.header .nav {
    float: left;
    margin-left: 60px;
}
.header .nav ul li {
    float: left;
    margin: 0 15px;
    list-style: none;
}
.header .nav ul li a {
    display: block;
    height: 42px;
    font-size: 18px;
    line-height: 42px;
    text-decoration: none;
    color: #050505;
}
.header .nav ul li a:hover {
    border-bottom: 2px solid #00a4ff;
}
.header .search {
    float: left;
    height: 42px;
    width: 412px;
    margin-left: 70px;
    /* background-color: #fff; */
}
.header input {
    float: left;
    width: 360px;
    height: 40px;
    border: 1px solid #00a4ff;
    border-right: 0;
    /* padding-left: 20px; */
    text-indent: 20px;
}
.header .search button {
    float: left;
    width: 50px;
    height: 42px;
    border: 0;
    background: url(images/study/btn.png);
}
.header .user {
    float: right;
    margin-right: 30px;
    font-size: 14px;
    line-height: 42px;
    text-indent: 10px;
    color: #666;
}
.header .user img {
    vertical-align: middle;
}
.banner {
    height: 420px;
    background-color: #1c036c;
}
.banner .w{
    height: 420px;
    background: url(images/study/banner2_20190819_210028.png) no-repeat top center;
}
.banner .bannav {
    float: left;
    height: 420px;
    width: 191px;
    background: rgba(0, 0, 0, 0.3);
}
.banner ul li {
    height: 45px;
    line-height: 45px;
    padding: 0 20px;
}
.banner ul li a {
    color: #fff;
    font-size: 14px;
}
.bannav ul li a span {
    float: right;
}
.bannav ul li a:hover {
    color: #00a4ff;
}
.banner .course {
    float: right;
    width: 228px;
    height: 300px;
    background-color: #ffffff;
    margin-top: 50px;
}
.banner .course h2 {
    width: 228px;
    height: 48px;
    line-height: 48px;
    font-size: 18px;
    text-align: center;
    color: #ffffff;
    background-color: #9bceea;
}
.banner .course .todo {
    padding: 0 18px;
}
.banner .course .todo ul li {
    padding: 10px 0;
    border-bottom: 1px solid #ccc;

}
.banner .course .todo ul li h3 {
    height: 15px;
    font-size: 14px;
    font-weight: 400;
    color: #4e4e4e;
}
.banner .course .todo ul li p {
    font-size: 12px;
    color: #a5a5a5;
}
.todo .all {
    display: block;
    height: 38px;
    border: 1px solid #00a4ff;
    margin-top: 5px;
    text-align: center;
    line-height: 38px;
    color: #00a4ff;
    font-size: 16px;
    font-weight: 400;
}
.goodsnav {
    /* width: 1200px; 版心类w设置过*/
    height: 60px;
    margin-top: 8px;
    background-color: white;
    line-height: 60px;
    box-shadow: 0px 2px 5px rgba(0, 0, 0, 0.2);
}
.goodsnav h2 {
    float: left;
    height: 16px;
    margin: 0 30px;
    font-size: 16px;
    color: #00a4ff;
    /* background-color: pink; */
}
.goodsnav ul {
    float: left;
}
.goodsnav ul li {
    float: left;
}
.goodsnav ul li a {
    padding: 0 30px;
    font-size: 16px;
    color: #050505;
    border-left: 1px solid #bfbfbf;
}
.goodsnav .change {
    float: right;
    margin-right: 30px;
    font-size: 14px;
    color: #00a4ff;
}
.box .box-hd {
    height: 42px;
    margin-top: 36px;
}
.box .box-hd h2 {
    float: left;
    font-size: 20px;
    font-weight: 400;
    color: #494949;
}
.box .box-hd .all {
    float: right;
    margin: 10px 30px auto auto;
    font-size: 12px;
    color: #a5a5a5;
}
.box .box-bd ul {
    /* 把li 的父亲ul 修改的足够宽一行能装开5个盒子就不会换行了 */
    width: 1300px;
} 
.box .box-bd ul li {
    position: relative;
    float: left;
    width: 229px;
    height: 271px;
    background-color: #fff;
    margin-right: 13.75px;
    margin-bottom: 15px;
}
.box .box-bd ul li em {
    position: absolute;
    top: 4px;
    right: -4px;
}
.box .box-bd ul li img {
    width: 100%;
}
.box .box-bd ul li h3 {
    margin: 20px 20px 10px 25px;
    font-size: 14px;
    font-weight: 400;
}
.box .box-bd ul li .info .level {
    margin: 0 2px 0 25px;
    font-size: 12px;
    color: #ff7c2d;
}
.box .box-bd ul li .info .people {
    font-size: 12px;
    color: #a5a5a5;
}
.footer {
    height: 410px;
    background-color: #fff;
}
.footer .copyright {
    float: left;
    margin-left: 20px;
    /* background-color: pink; */
}
.footer .copyright img {
    margin: 35px 0 25px 0;
}
.footer .copyright p {
    margin: 0 0 20px 0;
    font-size: 12px;
    color: #666666;
}
.footer .copyright a {
    display: block;
    width: 120px;
    height: 36px;
    color: #00a4ff;
    font-size: 16px;
    line-height: 36px;
    text-align: center;
    border: 1px solid #00a4ff;
}
.footer .links {
    float: right;
    margin-right: 20px;
    margin: 35px 20px 0 0;
    /* background-color: pink; */
}
.footer .links dl {
    float: left;
    margin-left: 120px;
}
.footer .links dl dt {
    font-size: 16px;
    color: #333333;
    margin-bottom: 13px;
}
.footer .links dl dd {
    font-size: 12px;
    line-height: 21px;
    color: #333333;
}
.footer .links dl dd a {
    font-size: 12px;
    color: #333333;
}